Preheat broiler. Combine cheese and 1/4 teaspoon of the basil in small bowl; set aside.
Spray 8-inch oven-safe skillet with cooking spray. Heat over medium heat. Add zucchini and mushrooms; cook and stir 4 minutes, or until tender.
Stir in Egg Beaters, remaining basil and salt. Cook without stirring until edges and bottom begin to set. Lift cooked part and gently scramble. Continue cooking until set.
Remove from heat. Top egg mixture with tomatoes and sprinkle with cheese. Place skillet under broiler 2 minutes, or until cheese is melted and lightly browned.